That is my experience. I installed the vocal processor and the 8megs of backed dram myself. And I found out that the holder of two simms are used for either memory simms or vocal processor chips, which come with the vocal processor card.

Basically, you cannot have both and that is the reason there is a jumper and that is the reason the user ashraf amir had problems. The only way to install those is to disable the vocal processor.

Now I might be wrong of course. But that is my experience.